Power supply tone compensation for voice band modems
AssigneePCTEL, Inc.
InventorsYurl Goldstein, Yuri Okunev
Life of this patent
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Abstract
A modem receiver has an equalizer which receives an input signal, an adaptive compensator, and a decision block which generates a decision related to the input signal. A difference between an output of the equalizer and a compensating signal output of the adaptive compensator provides an input for the decision block. A difference between the output of the equalizer and an output of the decision block provides an error estimation signal which is a first input to the adaptive compensator. A difference between the input to the decision block and the output of the decision block provides an error adaptation signal which is a second input to the adaptive compensator.
Claims23
A modem, comprising:
- a) a transmitter;
- and
- b) a receiver having an equalizer which receives an input signal, an adaptive compensator, and a decision block which generates a decision related to said input signal, a difference between an output of said equalizer and a compensating signal output of said adaptive compensator providing an input for said decision block, a difference between said output of said equalizer and an output of said decision block providing an error estimation signal which is a first input to said adaptive compensator, a difference between said input to said decision block and said output of said decision block providing an error adaptation signal which is a second input to said adaptive compensator.
In a modem having a receiver which has an equalizer which receives an input signal, an adaptive compensator, and a decision block which generates a decision related to said input signal, an improvement comprising:
- a difference between an output of said equalizer and a compensating signal output of said adaptive compensator providing an input for said decision block, a difference between said output of said equalizer and an output of said decision block providing an error estimation signal which is a first input to said adaptive compensator, a difference between said input to said decision block and said output of said decision block providing an error adaptation signal which is a second input to said adaptive compensator.
A method for improving modem performance in a modem having a transmitter and a receiver, the receiver having an equalizer which receives an input signal, an adaptive compensator, and a decision block which generates a decision related to said input signal, comprising:
- a) obtaining a first difference between an output of said equalizer and a compensating signal output of said adaptive compensator, and providing said difference as an input to said decision block;
- b) obtaining a second difference between said output of said equalizer and an output of said decision block and providing said second difference as an error estimation signal which is a first input to said adaptive compensator;
- and
- c) obtaining a third difference between said input to said decision block and said output of said decision block and providing said third difference as an error adaptation signal which is a second input to said adaptive compensator.
Dependencies are inferred from the claim text.